| Feature Key |
Description |
| allele |
Obsolete; see variation feature key |
| attenuator |
Sequence related to transcription termination |
| C_region |
Span of the C immunological feature |
| CAAT_signal |
`CAAT box' in eukaryotic promoters |
| CDS |
Sequence coding for amino acids in protein (includes stop codon) |
| conflict |
Independent sequence determinations differ |
| D-loop |
Displacement loop |
| D_segment |
Span of the D immunological feature |
| enhancer |
Cis-acting enhancer of promoter function |
| exon |
Region that codes for part of spliced mRNA |
| gene |
Region that defines a functional gene, possibly including upstream (promotor, enhancer, etc) and downstream control elements, and for which a name has been assigned. |
| GC_signal |
`GC box' in eukaryotic promoters |
| iDNA |
Intervening DNA eliminated by recombination |
| intron |
Transcribed region excised by mRNA splicing |
| J_region |
Span of the J immunological feature |
| LTR |
Long terminal repeat |
| mat_peptide |
Mature peptide coding region (does not include stop codon) |
| misc_binding |
Miscellaneous binding site |
| misc_difference |
Miscellaneous difference feature |
| misc_feature |
Region of biological significance that cannot be described by any other feature |
| misc_recomb |
Miscellaneous recombination feature |
| misc_RNA |
Miscellaneous transcript feature not defined by other RNA keys |
| misc_signal |
Miscellaneous signal |
| misc_structure |
Miscellaneous DNA or RNA structure |
| modified_base |
The indicated base is a modified nucleotide |
| mRNA |
Messenger RNA |
| mutation |
Obsolete: see variation feature key |
| N_region |
Span of the N immunological feature |
| old_sequence |
Presented sequence revises a previous version |
| polyA_signal |
Signal for cleavage & polyadenylation |
| polyA_site |
Site at which polyadenine is added to mRNA |
| precursor_RNA |
Any RNA species that is not yet the mature RNA product |
| prim_transcript |
Primary (unprocessed) transcript |
| primer |
Primer binding region used with PCR |
| primer_bind |
Non-covalent primer binding site |
| promoter |
A region involved in transcription initiation |
| protein_bind |
Non-covalent protein binding site on DNA or RNA |
| RBS |
Ribosome binding site |
| rep_origin |
Replication origin for duplex DNA |
| repeat_region |
Sequence containing repeated subsequences |
| repeat_unit |
One repeated unit of a repeat_region |
| rRNA |
Ribosomal RNA |
| S_region |
Span of the S immunological feature |
| satellite |
Satellite repeated sequence |
| scRNA |
Small cytoplasmic RNA |
| sig_peptide |
Signal peptide coding region |
| snRNA |
Small nuclear RNA |
| source |
Biological source of the sequence data represented by a GenBank record. Mandatory feature, one or more per record. For organisms that have been incorporated within the NCBI taxonomy database, an associated /db_xref="taxon:NNNN" qualifier will be present (where NNNNN is the numeric identifier assigned to the organism within the NCBI taxonomy database). |
| stem_loop |
Hair-pin loop structure in DNA or RNA |
| STS |
Sequence Tagged Site; operationally unique sequence that identifies the combination of primer spans used in a PCR assay |
| TATA_signal |
`TATA box' in eukaryotic promoters |
| terminator |
Sequence causing transcription termination |
| transit_peptide |
Transit peptide coding region |
| transposon |
Transposable element (TN) |
| tRNA |
Transfer RNA |
| unsure |
Authors are unsure about the sequence in this region |
| V_region |
Span of the V immunological feature |
| variation |
A related population contains stable mutation |
| - (hyphen) |
Placeholder |
| -10_signal |
`Pribnow box' in prokaryotic promoters |
| -35_signal |
`-35 box' in prokaryotic promoters |
| 3'clip |
3'-most region of a precursor transcript removed in processing |
| 3'UTR |
3' untranslated region (trailer) |
| 5'clip |
5'-most region of a precursor transcript removed in processing |
| 5'UTR |
5' untranslated region (leader) |
